R&D Report 1954-30 : The measurement of the vertical polar diagram of medium-wave transmitting aerials - summary of two methods.
R.A. Rowden, L.F. Tagholm, D.E. Susans, D.N. Cudlip
This report describes two methods for the measurement of the vertical polar diagrams of medium-wave aerials. A practical example of the application of both the methods is given as the results of measurements made on the high mast radiator at Bookman's Park on 877 kc/s.
One of the methods employs a direct measurement system in which field strength equipment is moved slowly over the aerial by means of a helicopter. In the second method the vertical polar diagram of the aerial is compared with that of a standard aerial of known vertical polar diagram by means of pulse transmissions reflected from the ionosphere.
Fairly good agreement was observed between the results obtained by the two methods and the calculated vertical polar diagram. It is concluded that either method may be used, but the pulse method is to be preferred on the grounds of economy and convenience.